<template>
  <div>
    <!--    面包屑导航区域-->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
<!--    卡片视图区域-->
    <el-card>
<!--      提示区域-->
      <el-alert
        title="添加商品信息"
        type="info"
        center
        show-icon :closable="false">
      </el-alert>
<!--      步骤条区域-->
      <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>
<!--      tab栏区域-->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
        <el-tabs v-model="activeIndex" :tab-position="'left'" :before-leave="beforeTabLeave" @tab-click="tabClicked">
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <el-cascader
                v-model="addForm.goods_cat"
                :options="catelist"
                :props="{ expandTrigger: 'hover',label: 'cat_name',value: 'cat_id',children: 'children' }"
                @change="handleChange"></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
<!--            复选框组-->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox :label="cb" v-for="(cb,i) in item.attr_vals" :key="i" border></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
<!--            action：表示图片要上传的后台API地址-->
            <el-upload
              :action="uploadURL"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              list-type="picture"
              :headers="headerObj"
              :on-success="handleSuccess">
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <quill-editor v-model="addForm.goods_introduce"></quill-editor>
            <el-button type="primary" class="AddBtn" @click="add">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>
<!--    图片预览-->
    <el-dialog
      title="图片预览"
      :visible.sync="previewVisible"
      width="50%">
      <img :src="previewPath" alt="" class="previewImg">
    </el-dialog>
  </div>
</template>

<script>
import _ from 'lodash'
export default {
  name: "Add",
  data() {
    return {
      activeIndex: '0',
      //添加商品的表单数据对象
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        // 商品所属的分类数组
        goods_cat: [],
        // 图片的数组
        pics: [],
        // 商品的详情描述
        goods_introduce: '',
        attrs: []
      },
      // 添加商品的表单验证规则
      addFormRules: {
        goods_name:[
          {required: true,message: '请输入商品名称',trigger: 'blur'}
        ],
        goods_price: [
          {required: true,message: '请输入商品价格',trigger: 'blur'}
        ],
        goods_weight: [
          {required: true,message: '请输入商品重量',trigger: 'blur'}
        ],
        goods_number: [
          {required: true,message: '请输入商品数量',trigger: 'blur'}
        ],
        goods_cat: [
          {required: true,message: '请选择商品分类',trigger: 'blur'}
        ]
      },
      // 商品分类列表
      catelist: [],
      // 动态参数列表数据
      manyTableData: [],
      // 静态属性列表
      onlyTableData: [],
      //上传图片的URL地址
      uploadURL:'http://127.0.0.1:8888/api/private/v1/upload',
      // 图片上传组件的headers请求头对象
      headerObj: {
        Authorization: window.sessionStorage.getItem("token")
      },
      // 已经上传的url路径
      previewPath: '',
      // 控制是否显示图片预览对话框
      previewVisible: false
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    // 获取所有商品分类数据
    async getCateList(){
      const {data: res} = await this.$http.get("/categories")
      if (res.meta.status !== 200){
        return this.$message.error("获取商品分类失败！")
      }
      this.catelist = res.data
      // console.log(this.catelist)
    },
    // 级联选择器选中项，会触发这个函数
    handleChange(){
      console.log(this.addForm.goods_cat)
      if (this.addForm.goods_cat.length !== 3){
        this.addForm.goods_cat = []
      }
    },
    // tabs标签离开和点击新的标签页之前触发
    beforeTabLeave(activeName,oldActiveName){
      // console.log("old标签页："+oldActiveName)
      // console.log("new标签页："+activeName)
      if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3){
        this.$message.error("请先选择商品分类！")
        return false
      }

    },
    //点击时触发
    async tabClicked(){
      // console.log(this.activeIndex)
      // 证明访问的是动态参数面板
      if (this.activeIndex === '1'){
          const {data: res} = await this.$http.get("/categories/" + this.cateId + "/attributes", {params: {sel: 'many'}})
          if (res.meta.status !== 200){
            return this.$message.error("获取动态参数列表失败！")
          }
      // console.log(res.data)
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(" ")
        })
        this.manyTableData = res.data
      }else if (this.activeIndex === '2'){
        const {data: res} = await this.$http.get("/categories/" + this.cateId + "/attributes", {params: {sel: 'only'}})
        if (res.meta.status !== 200){
          return this.$message.error("获取静态属性列表失败！")
        }
      this.onlyTableData = res.data
      }
    },
    // 处理图片预览效果
    handlePreview(file){
      // console.log(file)
      this.previewPath = file.response.data.url
      this.previewVisible = true
    },
    // 处理移除图片的操作
    handleRemove(file){
      // 1 获取将要删除的图片的临时路径
      // 2 从pics数组中，找到这个图片对应的索引值
      // 3 调用数组的splice方法，把图片信息对象，从pics数组中移除
      const filePath = file.response.data.tmp_path
      const i = this.addForm.pics.findIndex(x => x.pic === filePath)
      this.addForm.pics.splice(i,1)
      console.log(this.addForm)
    },
    // 监听图片上传成功的事件
    handleSuccess(response){
      // console.log(response)
      // 1 拼接得到一个图片信息对象
      const picInfo = {pic: response.data.tmp_path}
      // 2 将图片信息对象，push到pics数组中
      this.addForm.pics.push(picInfo)
      console.log(this.addForm)
    },
    // 添加商品
    add(){
      // console.log(this.addForm)
      this.$refs.addFormRef.validate(async valid => {
        if (!valid){
          return this.$message.error("请填写必要的表单项！")
        }
        // 执行添加业务逻辑
        // 先将addForm中的goods_cat从数组转换为字符串
        // lodash cloneDeep(obj) 进行深拷贝
        const form = _.cloneDeep(this.addForm)
        form.goods_cat = form.goods_cat.join(",")
        // 处理动态参数
        this.manyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,attr_value: item.attr_vals.join(" ")
          }
          this.addForm.attrs.push(newInfo)
        })
        // 处理静态属性
          this.onlyTableData.forEach(item => {
            const newInfo = {
              attr_id:item.attr_id,attr_value: item.attr_vals
            }
            this.addForm.attrs.push(newInfo)
          })
        form.attrs = this.addForm.attrs
        console.log(form)
        //发起请求添加商品
        // 商品的名称必须是唯一的
        const {data: res} = await this.$http.post("/goods", form)
        if (res.meta.status !== 201){
          return this.$message.error("添加商品失败！")
        }
        this.$message.success("添加商品成功！")
        this.$router.push("/goods")
      })
    }

  },
  computed: {
    cateId(){
      if (this.addForm.goods_cat.length === 3){
        return this.addForm.goods_cat[2]
      }
      return null
    }
  }
}
</script>

<style lang="less" scoped>
.el-checkbox {
  margin: 0 10px 0 0 !important;
}
.previewImg {
  width: 100%;
}
.AddBtn {
  margin-top: 15px;
}
</style>
